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<a href="mapreduce_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#ifndef GRPPI_MAPREDUCE_H </span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#define GRPPI_MAPREDUCE_H</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#include &lt;utility&gt;</span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="execution__traits_8h.html">common/execution_traits.h</a>&quot;</span></div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="iterator__traits_8h.html">common/iterator_traits.h</a>&quot;</span></div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacegrppi.html">grppi</a> {</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Execution, <span class="keyword">typename</span> ...InputIterators,</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    <span class="keyword">typename</span> Identity, <span class="keyword">typename</span> Transformer, <span class="keyword">typename</span> Combiner,</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <a class="code" href="namespacegrppi.html#a53d88980f8164547717a94058db08f94">requires_iterators</a>&lt;InputIterators...&gt; = 0&gt;</div><div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="group__mapreduce__pattern.html#ga1b61366b1688dc6d2d8dc6cbf785bf10">   57</a></span>&#160;<span class="keyword">auto</span> <a class="code" href="group__mapreduce__pattern.html#ga1b61366b1688dc6d2d8dc6cbf785bf10">map_reduce</a>(<span class="keyword">const</span> Execution &amp; ex,</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;                std::tuple&lt;InputIterators...&gt; firsts, std::size_t size,</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;                Identity &amp;&amp; identity,</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;                Transformer &amp;&amp;  transform_op, Combiner &amp;&amp; combine_op)</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;{</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;  static_assert(supports_map_reduce&lt;Execution&gt;(),</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;                <span class="stringliteral">&quot;map/reduce not supported on execution type&quot;</span>);</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;  <span class="keywordflow">return</span> ex.map_reduce(firsts, size,</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;                       std::forward&lt;Identity&gt;(identity),</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;                       std::forward&lt;Transformer&gt;(transform_op),</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;                       std::forward&lt;Combiner&gt;(combine_op));</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;}</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Execution, <span class="keyword">typename</span> ...InputIterators, <span class="keyword">typename</span> InputIt,</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;          <span class="keyword">typename</span> Identity, <span class="keyword">typename</span> Transformer, <span class="keyword">typename</span> Combiner,</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;          <a class="code" href="namespacegrppi.html#a53d88980f8164547717a94058db08f94">requires_iterators</a>&lt;InputIterators...&gt; = 0,</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;          <a class="code" href="namespacegrppi.html#a3d2bc58fb1b6a69c51324da8ac2b3d35">requires_iterator&lt;InputIt&gt;</a> = 0&gt;</div><div class="line"><a name="l00090"></a><span class="lineno"><a class="line" href="group__mapreduce__pattern.html#ga482a7464f7fe043ee62e179db0ddcb07">   90</a></span>&#160;<span class="keyword">auto</span> <a class="code" href="group__mapreduce__pattern.html#ga1b61366b1688dc6d2d8dc6cbf785bf10">map_reduce</a>(<span class="keyword">const</span> Execution &amp; ex,</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;                std::tuple&lt;InputIterators...&gt; firsts, InputIt last,</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;                Identity &amp;&amp; identity,</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;                Transformer &amp;&amp;  transform_op, Combiner &amp;&amp; combine_op)</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;{</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;  static_assert(supports_map_reduce&lt;Execution&gt;(),</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;                <span class="stringliteral">&quot;map/reduce not supported on execution type&quot;</span>);</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;  <span class="keywordflow">return</span> ex.map_reduce(firsts,</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;                       std::distance(std::get&lt;0&gt;(firsts),last),</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;                       std::forward&lt;Identity&gt;(identity),</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;                       std::forward&lt;Transformer&gt;(transform_op),</div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;                       std::forward&lt;Combiner&gt;(combine_op));</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;}</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Execution, <span class="keyword">typename</span> InputIterator, <span class="keyword">typename</span> Identity, </div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;          <span class="keyword">typename</span> Transformer, <span class="keyword">typename</span> Combiner,</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;          <a class="code" href="namespacegrppi.html#a3d2bc58fb1b6a69c51324da8ac2b3d35">requires_iterator&lt;InputIterator&gt;</a> = 0&gt;</div><div class="line"><a name="l00122"></a><span class="lineno"><a class="line" href="group__mapreduce__pattern.html#ga35ec6ba7101c5fb6e21173914e7952ba">  122</a></span>&#160;<span class="keyword">auto</span> <a class="code" href="group__mapreduce__pattern.html#ga1b61366b1688dc6d2d8dc6cbf785bf10">map_reduce</a>(<span class="keyword">const</span> Execution &amp; ex, </div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;                InputIterator first, InputIterator last, </div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;                Identity &amp;&amp; identity, </div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;                Transformer &amp;&amp;  transform_op, Combiner &amp;&amp; combine_op)</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;{</div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;  static_assert(supports_map_reduce&lt;Execution&gt;(),</div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    <span class="stringliteral">&quot;map/reduce not supported on execution type&quot;</span>);</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;  <span class="keywordflow">return</span> ex.map_reduce(make_tuple(first), std::distance(first,last), </div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;      std::forward&lt;Identity&gt;(identity),</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;      std::forward&lt;Transformer&gt;(transform_op), </div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;      std::forward&lt;Combiner&gt;(combine_op));</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;}</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;</div><div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Execution, <span class="keyword">typename</span> InputIterator, <span class="keyword">typename</span> Identity, </div><div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;          <span class="keyword">typename</span> Transformer, <span class="keyword">typename</span> Combiner,</div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;          <span class="keyword">typename</span> ... OtherInputIterators,</div><div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;          requires_iterator&lt;InputIterator&gt; = 0&gt;</div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;[[deprecated(<span class="stringliteral">&quot;This version of the interface is deprecated.\n&quot;</span></div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;             <span class="stringliteral">&quot;If you want to use multiple inputs, use a tuple instead.&quot;</span>)]]</div><div class="line"><a name="l00156"></a><span class="lineno"><a class="line" href="group__mapreduce__pattern.html#ga5ec4467c1384f59683c419f2e937e5bc">  156</a></span>&#160;<span class="keyword">auto</span> <a class="code" href="group__mapreduce__pattern.html#ga1b61366b1688dc6d2d8dc6cbf785bf10">map_reduce</a>(<span class="keyword">const</span> Execution &amp; ex,</div><div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;                InputIterator first, InputIterator last, </div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;                Identity &amp;&amp; identity, </div><div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;                Transformer &amp;&amp;  transform_op, Combiner &amp;&amp; combine_op,</div><div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;                OtherInputIterators ... other_firsts)</div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;{</div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;  static_assert(supports_map_reduce&lt;Execution&gt;(),</div><div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;    <span class="stringliteral">&quot;map/reduce not supported on execution type&quot;</span>);</div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;  <span class="keywordflow">return</span> ex.map_reduce(make_tuple(first, other_firsts...), </div><div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;      std::distance(first,last), </div><div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;      std::forward&lt;Identity&gt;(identity),</div><div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;      std::forward&lt;Transformer&gt;(transform_op), </div><div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;      std::forward&lt;Combiner&gt;(combine_op));</div><div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;}</div><div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;</div><div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;}</div><div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;</div><div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="namespacegrppi_html"><div class="ttname"><a href="namespacegrppi.html">grppi</a></div><div class="ttdef"><b>Definition:</b> callable_traits.h:26</div></div>
<div class="ttc" id="execution__traits_8h_html"><div class="ttname"><a href="execution__traits_8h.html">execution_traits.h</a></div></div>
<div class="ttc" id="namespacegrppi_html_a53d88980f8164547717a94058db08f94"><div class="ttname"><a href="namespacegrppi.html#a53d88980f8164547717a94058db08f94">grppi::requires_iterators</a></div><div class="ttdeci">std::enable_if_t&lt; are_iterators&lt; T... &gt;, int &gt; requires_iterators</div><div class="ttdef"><b>Definition:</b> iterator_traits.h:64</div></div>
<div class="ttc" id="group__mapreduce__pattern_html_ga1b61366b1688dc6d2d8dc6cbf785bf10"><div class="ttname"><a href="group__mapreduce__pattern.html#ga1b61366b1688dc6d2d8dc6cbf785bf10">grppi::map_reduce</a></div><div class="ttdeci">auto map_reduce(const Execution &amp;ex, std::tuple&lt; InputIterators... &gt; firsts, std::size_t size, Identity &amp;&amp;identity, Transformer &amp;&amp;transform_op, Combiner &amp;&amp;combine_op)</div><div class="ttdoc">Invoke Map/reduce pattern on a data sequence. </div><div class="ttdef"><b>Definition:</b> mapreduce.h:57</div></div>
<div class="ttc" id="iterator__traits_8h_html"><div class="ttname"><a href="iterator__traits_8h.html">iterator_traits.h</a></div></div>
<div class="ttc" id="namespacegrppi_html_a3d2bc58fb1b6a69c51324da8ac2b3d35"><div class="ttname"><a href="namespacegrppi.html#a3d2bc58fb1b6a69c51324da8ac2b3d35">grppi::requires_iterator</a></div><div class="ttdeci">std::enable_if_t&lt; is_iterator&lt; T &gt;, int &gt; requires_iterator</div><div class="ttdef"><b>Definition:</b> iterator_traits.h:58</div></div>
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